Process of treating and preserving metal patterns from corrosion.



NITED STATE .FCYHARLES KIDNER. MILNE, or games, on'rsnro, CANADA. 4 .5;

PATENT o en PROCESS OF TREATING AND PREsERvIne METAL FAHTIEBNS FROMconnosron.

I Specification of Letters Patent,

Batented Sept. 22, 1908.

Application filed June 22, 1903. \Serizil my. @335 ,1

' To all whom/it may concern;

Be it known that 1, CHARLES KIDNnn MILNE, a citizen of the Dominion ofCanada, residing at the city of Hamilton, in the 5' county of Wentworth,in the Province of Ontario, Canada, have invented a certain new anduseful Improved Art or Process of Treating and Preserving Metal Patternsfrom Corrosion; and I do hereby declare the following to be a fulldescription of the same.

My invention relates to an improved art or process of treating metalpatterns more particularly iron patterns used by iron founders, in suchamanncr as to prevent rust from forming upon them.

llerctofore there has been much difficulty of keeping such patterns fromrustin as rust renders patterns unfit to make smooth molds for castingbesides causing much trouble and loss of time in trying to remedy thesaid evil and the-object of my improved art or process is to treat thesaid patterns in such a manner as to entirely and effectually preventrust from forming upon them and prevent all loss of time and annoyancecaused by rusty patterns.

In treating old iron patterns to prevent rust I first subject them to anair blast .on a wind wheel then dip the pattern in a solution of" threepints of sulfuric acid and twenty gallons of boiling water, allowing thepattern to be submerged about five minutes to start the rust. Thepattern isthen dipped in a solution of boiling otash and water andallowed to stand a row minutes; it is then scoured on a No. 30 emerywheel until clear of dirt and rust. The pattern is then dipped in asolution of one quart of sulfuric acid and twenty gallons of cold waterto neutralize the potash on the pattern; it is next dipped in a solutionof cyanidof potassium, two ounces to one gallon of cold water, toneusulfuric acid. and cold water,

in pure'coid. water, and it is now render a condition to be submerged ina final bath as follows, t lb. 531 soda. lb. white stick potash. 6 lbs.sulfate of co per. 6 lbs. cyanid of potassium, chemical y ure. 9 gallonshot water. The above ingre rents to be mixedseparately and poured backinto the solution which should testdfi hydrometer anodes, Wei-lied hotand connected to an electric dynamo. After the pattern is coated withthe above solution it is heated and given a coating of hot )araflin Waxand polished with a hard brush to giveit a smooth surface which willmake smoothiznolds and revent rust.

Having thus described or. process and its advantages, what I claim anddesire to secure by Letters Patent, is,

The improved art or process of treating metal patterns for theprevention of rust, consisting of the treatment of the pattern, (1), toa wind blast, (2), to the action of sulfuric-acid and boiling water,(3), then in a solution'of hailing potash and water, (4) then subjectedto the action of powdered emery, (5) then'subjected to the action of (6)then dip ed in a solution of cyanid of potassium an cold water, t7),then immersed and treated electrically in a solution of sal soda, whitestick potash, sulfate of copper, cyanid of potassium and hot water, andafterwards given a coating of hot parafiin wax, all the ingredients 7 edand the pattern treated in or about the proportions substantially as andfor the purpose specified.

Hamilton, ()ntsrio, May, 28, 1908.

GHARLES KIDNER MILNE. Signed in the presence of- Enwann Gory, WM. Bacon;

halite the SEEMHIEG acid, next it is dipped e in my improved art

